Remove 'local_iterator_base'.
Merged revisions 42153-42156 via svnmerge from
https://svn.boost.org/svn/boost/branches/unordered/dev
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r42153 | danieljames | 2007-12-18 22:51:31 +0000 (Tue, 18 Dec 2007) | 2 lines
Remove 'local_iterator_base'. It isn't really needed.
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r42155 | danieljames | 2007-12-18 22:58:12 +0000 (Tue, 18 Dec 2007) | 1 line
Add a helper function for creating null pointers.
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r42156 | danieljames | 2007-12-18 23:14:49 +0000 (Tue, 18 Dec 2007) | 3 lines
Check that I'm using link_ptr & bucket_ptr correctly (they should be distinct
types with an explicit conversion from bucket_ptr to link_ptr).
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